En Thu, 21 Jun 2007 02:45:38 -0300, <[EMAIL PROTECTED]> escribió:
> I want to take read an input file (sels.txt) that looks like:
>
> Begin sels
> sel1 = {1001, 1002, 1003, ...
> ...
> 1099}
>
> sel2 = {1001, 1008, 1009 ...
> ...
> 1299}
> End sels
>
> And turn it into an output file for each of the "sels" in the input
> file, i.e
> sel1.txt:
>
> L1001
> L1002
> L1003
> ...
> L1099
- You could ignore the begin and end lines; the important delimiters
appear to be { and }
- Repeat:
- read lines until you find a {
- extract whatever is at the left of = as the "sel" name; keep whatever
is at the right of the { as the first line of data
- keep reading more lines until you find a }
- split each of those lines on every "," to get your output items
- write the output file, you are done with one "sel"
- Keep going until end of input file.
Some tips:
- You can iterate along the lines in a file using
for line in some_file:
....
but perhaps in this case it may be more convenient to use
some_file.readline()
- The expression: "x" in line, tests if line contains any "x"
- You will find the string methods useful:
http://docs.python.org/lib/string-methods.html
In particular: find, split, strip, partition look promising in this case.
--
Gabriel Genellina
--
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